One such option is a zero-deposit mortgage, where you can qualify for a home loan without putting down any cash up front. During the first five years of homeownership alone, a buyer with a zero-deposit mortgage pays an estimated £158,104 in interest on the typical £471,687 home. POLL Poll What do you think about zero-deposit mortgages? How do zero-deposit mortgages actually work? The latest addition to the selection of zero-deposit mortgages, with a loan-to-value ratio of between 95% and 100%, is from Metro Bank.